Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 16 of 16 for “"particle attachment"”.
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Water quality effects on the bubble-particle attachment of sulfide minerals
probability, mass of particles recovered in the ACTA and further validation with microflotation recovery that bubble-particle interaction increases as the ionic strength of the plant water increases. This was the case with both chalcopyrite and galena particles. Literature would suggest that this …
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Development of spectroscopic smartphone biosensors for point-of-care applications
… subcellular behavior and also to perform single-particle attachment quantification. Finally, this work explores how the single-particle attachment quantification capability can be leveraged to measure HIV viral load using a novel biosensor, designed specifically developed for a smartphone based …
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A bubble-particle interaction model for flotation combining hydrodynamic and surface forces
It is generally recognized that the recovery of particles from a flotation pulp is controlled by (i) the flotation rate constant and (ii) the residence time distribution of the particles. In the present work, theoretical and experimental analyses have been carried out to develop methods for …
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Development and Validation of a Simulator based on a First-Principle Flotation Model
… from the basic mechanisms involved in the bubble-particle and bubble-bubble interactions occurring in a flotation cell (Yoon and Mao, 1996; Sherrell and Yoon, 2005; Do, H, 2010). The model consists of a series of analytical equations for bubble generation, bubble-particle collision, attachment, …
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Cross-regional word duration patterns in Mandarin
… word category, word internal structure, particle attachment, speech rate of sentence have significant effects on syllable duration. Thirdly, social factor---region interacts with multiple linguistic factors (word structure, syllable position, and particle attachment) and plays an …
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Modeling of Solid Particle Transport in Fractures and Its Applications to Proppant Placement During Hydraulic Fracturing Operations
… the operational costs. In recent decades, nanoparticles (NPs) have seen their promising potentials in recovering hydrocarbons from numerous laboratory experiments and field pilots. Also, hydraulic fracturing techniques have unlocked a significant quantity of hydrocarbon resources from …
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Development of a turbulent flotation model from first principles
… (pulp), so that bubbles coated with hydrophobic particles rise to the top and form a froth phase while hydrophobic particles stay in suspension. The selectivity of the flotation process is determined by the hydrophobicity of the particulate materials involved, while the kinetics of the process is …
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In-Plant Testing of the Hydrofloat Separator for Coarse Phospahte Recovery
… and then aerated. The reagentized phosphate particles become buoyant and report to the product launder after encountering and attaching to the rising air bubbles. Simultaneously, the hydrophilic particles are rejected as a high solids content (65-70%) underflow. The fluidized bed acts as a …
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Functions of Phosphatidylinositol 4-Phosphate 5 Kinases in Actin Cytoskeletal Regulation During Phagocytosis
… actin cytoskeleton and are defective in attachment to IgG-opsonized particles and FcgR clustering. Delivery of exogenous PIP2 rescued these defects. PIP5Kg knockout BMM also have more RhoA and less Rac1 activation and pharmacological manipulations establish that they contribute to the …
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The synergistic interaction between dithiophosphate and frothers at the air-water and mineral-water interface
… their mixtures on mineral recovery and bubble-particle attachment It was found that DTP in the presence of a non-ionic frother synergistically improved sulphide mineral recovery. This improvement was attributed to attractive molecular interactions which were found to occur between the collector …
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Understanding Electrode-Electrolyte Interfaces with Metal Dissolution and Redeposition Chemistry
… a non-classical crystallization pathway of particle attachment, but the initial growth of crystals is inhibited by internal strains; and (3) as the strain accumulates, the crystal rotates or moves, which is the fundamental reason for the dynamic structure evolution of the crystal during …
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Mechanisms of Coral Calcification: a Geochemical and Computational Approach to Understanding Biomineralisation
… modes: ion-by-ion precipitation and particle attachment. My new model reiterates that the calcifying space remains relatively open to seawater exchange, leaving corals potentially vulnerable to future ocean chemistry changes. Together, the experimental and modelling results bring us …
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REACTIVE TRANSPORT OF IRON AND HYDROCHAR COLLOIDS IN A HYDROCARBON-CONTAMINATED SUBSURFACE ENVIRONMENT
… type affect the mechanism and rate of hydrochar attachment onto and detachment from a silty-clay soil. Equilibrium and non-equilibrium advection-dispersion equations were employed to model break- through curves obtained from the miscible displacement experiments, and a pseudo-first order kinetic …
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Investigating the role of dithiophosphate in the flotation of base metal sulfides
… to investigate the effect that SEDTP had on particle hydrophobicity. Collector-less and pure reagent flotation recoveries were established to relate the effect that reagents had on the floatability. The microflotation of pyrite was carried out at pH 4 and pH 9 to investigate the effect of pH …
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Synthesizing and Screening High Mobility Nanoparticles for Advanced Oil Recovery
… to the oil and gas industry. Coating the nanoparticles with polymers can provide both chemical and solution stability to nanoparticles, protecting the inorganic core from dissolution and the particles themselves from aggregation. Chapter 2 describes the synthesis of a library of …
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Considering the Action of Degrading Water Quality on the Electrochemical Response of Sulphide Minerals
… interfaces to destabilize thus reducing bubble-particle attachment time. Rest potential measurements revealed that dixanthogen and lead xanthate were likely the dominant surface reaction species formed on chalcopyrite and galena during collector adsorption, respectively. The only exceptions were …